//
//  WBNavigationController.swift
//  weibo
//
//  Created by swift on 17/2/22.
//  Copyright © 2017年 jason. All rights reserved.
//

import UIKit

class WBNavigationController: UINavigationController {
    override func viewDidLoad() {
        super.viewDidLoad()
        //隐藏默认的navigationbar
        navigationBar.isHidden = true
    
        }
    
    ///重写push方法,所有的push动作都会调用此方法
    override func pushViewController(_ viewController: UIViewController, animated: Bool) {
        //如果不是栈底控制器才需要隐藏.根控制器不需要处理
        if childViewControllers.count>0{
            
            
            //判断控制器的类型
            if let vc = viewController as? WBBaseViewController{
                var title = "返回"
                //判断控制器的级数,只有一个子控制器的时候,显示栈底控制器的标题
                if childViewControllers.count == 1{
                    //
                    title = childViewControllers.first?.title ?? "返回"
                }
                //取出自定义bar的item,设置左侧按钮作为返回按钮
                vc.navitem.leftBarButtonItem = UIBarButtonItem(title: title, fontSize: 16, target: self, action: #selector(popToParent), isBack: true)
            
            }
            viewController.hidesBottomBarWhenPushed = true
        }
         super.pushViewController(viewController, animated: true)
    }
    @objc fileprivate func popToParent(){
        popViewController(animated: true)
    }

   

}
